Sprocket protective sleeve and sprocket suitable for the sprocket protective sleeve

Abstract

A sprocket protective sleeve and a sprocket suitable for the protective sleeve are disclosed. The protective sleeve covers the circumferential sides of several chain teeth of the sprocket and includes a tooth protector and a through-hole. The tooth protector is cylindrical and has several tooth-enclosing portions protruding outwards from its circumferential sidewalls corresponding to the chain teeth. An accommodating space with the same cross-sectional shape as the sprocket is formed inside the tooth protector. Side openings communicating with the accommodating space are formed on both sides of the tooth protector. A fixing portion is also provided on the tooth protector. The sprocket is positioned within the accommodating space through one of the side openings, and the chain teeth are covered and fixed by the tooth-enclosing portions. The through-hole passes through the fixing portion and the locking portion of the sprocket to securely engage and fix the tooth protector to the sprocket. Accordingly, using the sprocket protective sleeve as a component to protect the sprocket and its transmission with the chain can reduce wear on the sprocket during transmission, and by replacing worn sprocket protective sleeves, equipment operation and maintenance costs can be reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of sprockets, and in particular to a sprocket protective sleeve and a sprocket suitable for the sprocket protective sleeve. Background Technology

[0002] A sprocket is a component that works in conjunction with a chain to transmit power. Transmission systems consisting of sprockets and chains are widely used in manufacturing, transportation, and many other fields. Since the main transmission component of a sprocket is the chain teeth, power is transmitted through the meshing of the teeth with chain links. However, long-term, high-frequency contact, stress, and friction between the teeth and chain leads to wear on the surface of the teeth, and the degree of wear intensifies with increased usage time. Traditional sprockets typically employ a one-piece structure, meaning the teeth and the sprocket body are integrally molded. This means that when the teeth are damaged and cannot reliably mesh with the chain links, the entire sprocket must be replaced. This results in high operating and maintenance costs and significant resource waste. Therefore, reducing the use and maintenance costs of sprockets and improving resource utilization has become one of the urgent technical problems to be solved in this field. Utility Model Content

[0003] The technical problem this solution aims to solve is how to reduce the cost of using and maintaining sprockets and improve resource utilization.

[0004] To solve the above-mentioned technical problems, this technical solution provides a sprocket protective sleeve, which is used to cover the circumferential side of several sprocket teeth and includes: a tooth protector sleeve and a through-hole portion. The tooth protector sleeve is cylindrical and has several tooth-covering portions protruding outward on its circumferential sidewalls corresponding to the several sprocket teeth. The tooth protector sleeve has an accommodating space with the same cross-sectional shape as the sprocket. The two sides of the tooth protector sleeve have side openings communicating with the accommodating space. The tooth protector sleeve is also provided with a fixing portion. The sprocket is disposed in the accommodating space through one of the side openings and the several sprocket teeth are covered and fixed by the several tooth-covering portions. The through-hole portion passes through the fixing portion and the locking portion of the sprocket to fix the tooth protector sleeve to the sprocket. Accordingly, by covering the circumferential side of the sprocket with a sprocket protective sleeve, the sprocket teeth are protected by the sleeve's tooth-covering portion, making this portion the contact point with the chain links to withstand contact wear caused during transmission. The sprocket inside the protective sleeve provides structural support for the overall sprocket structure. Since the sprocket does not contact the chain links during transmission, it does not wear, effectively extending its service life. Furthermore, the tooth-covering portion of the protective sleeve undergoes slight deformation under transmission forces, resulting in a tighter fit with the chain teeth, thus improving the stability of the sprocket-sprocket connection. When the protective sleeve wears out due to long-term operation, it can be easily removed from the sprocket and replaced with a new one, allowing the sprocket structure to be reused. Since the cost of the protective sleeve is significantly lower than that of the sprocket, this reduces equipment operating and maintenance costs and improves resource utilization due to the reusability of the sprocket.

[0005] As another implementation of this technical solution, the distance between the two end edges of the toothed portion in the axial direction of the toothed sleeve gradually decreases along the direction away from the axis of the toothed sleeve. Accordingly, the structure of the toothed portion with its thickness gradually decreasing from the inside to the outside along the radial direction of the sprocket protective sleeve is better suited for covering the chain teeth of some sprockets with an outwardly tapering structure. That is, the thickness change of the toothed portion is consistent with the thickness change of the chain teeth of the sprocket. This chain tooth tapering structure is more conducive to the toothed portion covering the chain teeth entering and exiting the engagement space of the chain link.

[0006] As another implementation of this technical solution, the sprocket protective sleeve further includes: several tooth-protecting side plates. The shape of the tooth-protecting side plates is the same as the cross-sectional shape of the tooth-covering portion, and the curvature of the tooth-protecting side plates is the same as the curvature of the two end edges of the tooth-covering portion. These tooth-protecting side plates are respectively fixedly attached to the two end edges of the tooth-covering portion with their concave surfaces facing inwards. Therefore, the tooth-protecting side plates provide effective protection for both sides of the sprocket teeth.

[0007] As another implementation of this technical solution, a slit is formed along the axial direction of the toothed sleeve on the sidewall between two adjacent toothed portions. The sidewalls of the toothed sleeve on both sides of the slit can separate in opposite directions under the action of two opposing external forces. When the two opposing external forces disappear, under the action of the deformation recovery force of the toothed sleeve, the separated sidewalls of the toothed sleeve close together and form a slit between them. Accordingly, by applying two opposing external forces to the sidewalls of the toothed sleeve on both sides of the slit, the sidewalls on both sides of the slit can be separated, thereby increasing the inner diameter of the toothed sleeve, which facilitates the loading and unloading of the sprocket.

[0008] As another implementation of this technical solution, the fixing part is composed of four L-shaped strips. The surfaces of the four L-shaped strips are all parallel to the cross-section of the tooth protector sleeve, and the horizontal sections of the four L-shaped strips are all perforated. Two L-shaped strips are stacked facing each other with their horizontal sections facing each other and their perforations aligned. The upper ends of the vertical sections of the two L-shaped strips are respectively fixed to one side edge of the sidewall between two adjacent tooth protectors on each side of the fracture. The other two L-shaped strips are also stacked facing each other with their horizontal sections facing each other and their perforations aligned. The upper ends of the vertical sections of each L-shaped strip are fixedly attached to the other side edge of the sidewall between two adjacent toothed portions on each side of the fracture. When the sidewalls on both sides of the fracture are subjected to two opposing external forces, the horizontal sections of two L-shaped strips and the other two L-shaped strips, which are stacked on top of each other, move in opposite directions, causing the two aligned perforations to misalign. When the opposing external forces disappear, under the deformation-restoring force of the toothed sleeve, the two stacked horizontal sections move towards each other, aligning the two perforations on them. Therefore, the four L-shaped strips respectively disposed on the two side openings of the toothed sleeve can clamp the sprocket installed in the accommodating space, thereby improving the stability of the connection between the sprocket and the toothed sleeve.

[0009] As another implementation of this technical solution, the through-hole is a bolt and nut screw-in structure, and the locking part is a screw-in hole provided in the accommodating space for the corresponding through hole of the sprocket. The bolt passes through the four L-shaped strips' aligned through holes and the sprocket's screw-in hole, and is screwed into the nut to secure the tooth protector sleeve to the sprocket. This further improves the stability of the connection between the sprocket and the tooth protector sleeve.

[0010] As another implementation of this technical solution, the fixing part consists of at least two through holes opened on the side wall between multiple adjacent toothed parts of the tooth protector sleeve; the locking part consists of at least two threaded screw holes with internal threads opened on the sprocket corresponding to the at least two through holes, located within the accommodating space; and the through-hole part consists of at least two hexagonal plug screws. The hexagonal plug screws pass through the through holes and are screwed into the corresponding threaded holes to secure the tooth protector sleeve to the sprocket. This simplifies the structure of the sprocket protective sleeve.

[0011] As another implementation of this technical solution, when there are two through holes, two threaded holes, and two hexagonal plug screws, the two through holes are located asymmetrically on the sprocket guard, and the two threaded holes are located asymmetrically on the sprocket corresponding to the positions of the two through holes. Therefore, the asymmetry of the fixing structure can effectively prevent the sprocket guard from wobbling during use.

[0012] To address the aforementioned technical problems, this technical solution provides a sprocket suitable for use with a sprocket protective sleeve having an L-shaped strip on the tooth guard and perforations thereon. The sprocket has screw holes corresponding to the perforations, and the sum of the thickness of the sprocket teeth and the thickness of the two tooth guard side plates is equal to the thickness of the teeth of a standard sprocket. The sum of the width of the sprocket teeth and the thickness of the two side walls of the tooth guard portion is also equal to the width of the teeth of a standard sprocket. The sum of the diameter of the sprocket and the thickness of the two side walls of the tooth guard portion is also equal to the diameter of a standard sprocket. Therefore, this sprocket can be used in conjunction with a sprocket protective sleeve having an L-shaped strip.

[0013] To address the aforementioned technical problems, this technical solution also provides a sprocket. This sprocket is suitable for use with a sprocket protective sleeve having a through hole on its side wall. The sprocket has a threaded hole corresponding to the through hole, and the thickness of the sprocket teeth is equal to or less than the thickness of the teeth of a conventional sprocket. The width of the sprocket teeth plus the sum of the thicknesses of the two side walls of the tooth-covering portion is equal to the width of the teeth of a conventional sprocket, and the diameter of the sprocket plus the sum of the thicknesses of the two side walls of the tooth-covering portion is equal to the diameter of a conventional sprocket. Therefore, this sprocket can be used in conjunction with a sprocket protective sleeve having a through hole on its side wall. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the first embodiment of the sprocket protective sleeve of this utility model;

[0015] Figure 2 A front view of the first embodiment of the sprocket protection sleeve for mounting the adapted sprocket;

[0016] Figure 3 This is a side view of the first embodiment of the sprocket protective sleeve;

[0017] Figure 4This is a partially enlarged schematic diagram of the toothed portion in the first embodiment of the sprocket protective sleeve;

[0018] Figure 5 This is a schematic diagram of the second embodiment of the sprocket protective sleeve of this utility model;

[0019] Figure 6 A front sectional view of the second embodiment of the sprocket protection sleeve for mounting the adapted sprocket;

[0020] Figure 7 This is a side view of the second embodiment of the sprocket protective sleeve.

[0021] Explanation of symbols in the attached diagram:

[0022] A. Sprocket protective sleeve; a1. Tooth protector sleeve; a11. Tooth covering part; a12. Tooth protector side plate; a13. Slit; a2. Fixing part; a21. L-shaped strip; a22. Through hole; a3. Through-installation part; a31. Bolt; a32. Nut; a4. Accommodating space; A' Sprocket protective sleeve; a1' Tooth protector sleeve; a11' Tooth covering part; a2' Fixing part; a21' Through hole; a3' Through-installation part; a31' Socket head cap screw; a4' Accommodating space; B. Sprocket; B' Sprocket; b1' Chain tooth; b2' Locking part; b21' Screw hole. Detailed Implementation

[0023] The detailed description and technical content of this utility model are explained below with reference to the accompanying drawings. However, the accompanying drawings are provided for reference and illustration only and are not intended to limit this utility model.

[0024] In the context of this specification, any two or more embodiments of this utility model can be arbitrarily combined, and the resulting technical solutions are part of the original disclosure of this specification and also fall within the protection scope of this utility model.

[0025] This utility model's sprocket protective sleeve is used to cover the circumferential sides of several chain teeth of a sprocket to protect the sprocket, especially the chain teeth. Combined with... Figure 1 , 2As shown in Figures 5 and 6, the sprocket protective sleeves A and A' of this utility model include toothed sleeves a1 and a1' and through-holes a3 and a3'. The toothed sleeves a1 and a1' are cylindrical and have several toothed portions a11 and a11' protruding outwards from their circumferential sidewalls corresponding to several teeth of the sprockets B and B'. The toothed sleeves a1 and a1' have internal accommodating spaces a4 and a4' with the same cross-sectional shape as the sprockets B and B'. The two side edges of the toothed sleeves a1 and a1' are respectively... A side opening communicating with the accommodating spaces a4 and a4' is formed. The tooth protectors a1 and a1' are also provided with fixing parts a2 and a2'. The sprockets B and B' are disposed in the accommodating spaces a4 and a4' through one of the side openings, and the teeth are covered and fixed by the teeth covering parts a11 and a11'. The through parts a3 and a3' are inserted into the fixing parts a2 and a2' and the locking parts of the sprockets B and B' to fix the tooth protectors a1 and a1' to the sprockets B and B'.

[0026] Specifically, combined Figure 1 , 2 Figures 3 and 4 show schematic diagrams of the first embodiment of the sprocket protective sleeve A of this utility model. In this first embodiment, as shown... Figure 4 As shown, the distance L between the two end edges of the toothed portion a11 and the toothed sleeve a1 in the axial direction gradually decreases along the direction away from the axis of the toothed sleeve a1. The structure of the toothed portion a11, which gradually decreases in thickness from the inside to the outside along the radial direction of the sprocket protective sleeve A, is better suited for the teeth of some sprockets B. Figure 2 The chain teeth (not shown due to being covered by the tooth-covering portion) have an outwardly tapering structure, meaning the thickness variation of the tooth-covering portion a11 matches the thickness variation of the chain teeth in sprocket B. This tapering structure facilitates the engagement space of the tooth-covering portion a11 (not shown) with the chain teeth entering and exiting the chain link. Additionally, the sprocket protective sleeve A may include several tooth-protecting side plates a12. The shape of the side plates a12 is the same as the cross-sectional shape of the tooth-covering portion a11, and the curvature of the side plates a12 is the same as the curvature of the two end edges of the tooth-covering portion a11. These side plates a12 are fixedly attached to the two end edges of the tooth-covering portion a11 with their concave surfaces facing inward. The side plates a12 provide more effective protection for the sides of the chain teeth.

[0027] In the first embodiment of the sprocket protective sleeve A, a slit a13 can be provided on the side wall between two adjacent toothed portions a11 of the toothed sleeve a1 along the axial direction of the toothed sleeve a1. The side walls of the toothed sleeve a1 on both sides of the slit a13 can separate in opposite directions under the action of two opposite external forces. When the two opposite external forces disappear, under the action of the deformation recovery force of the toothed sleeve a1, the separated side walls of the toothed sleeve a1 close together and form the slit a13 between them. Accordingly, by the action of two opposite external forces on the side walls of the toothed sleeve a1 on both sides of the slit a13, the side walls on both sides of the slit a13 can be separated from each other, thereby increasing the inner diameter of the toothed sleeve a1 to facilitate the loading and unloading operation of the sprocket B.

[0028] Furthermore, in the first embodiment of the sprocket protective sleeve A, the fixing part a2 can be composed of four L-shaped strips a21. The surfaces of the four L-shaped strips a21 are all parallel to the cross-section of the toothed sleeve a1, and the horizontal sections of the four L-shaped strips a21 are all provided with through holes a22. Two L-shaped strips a21 are stacked facing each other with their respective horizontal sections so that their respective through holes a22 are aligned. The upper ends of the vertical sections of the two L-shaped strips a21 are respectively fixed to one side edge of the sidewall between two adjacent toothed parts a11 on each side of the fracture a13. The other two L-shaped strips a21 are also stacked facing each other with their respective horizontal sections so that their respective through holes are aligned. The upper ends of the vertical sections of the other two L-shaped strips a22 are fixedly attached to the other side edge of the sidewall between two adjacent toothed portions a11 on each side of the fracture a13. When the sidewalls on both sides of the fracture a13 are subjected to two opposite external forces, the overlapping horizontal sections of the two L-shaped strips a21 and the other two L-shaped strips a21 move in opposite directions, causing the two aligned perforations a22 to misalign. When the two opposite external forces disappear, under the deformation restoring force of the toothed sleeve a1, the two overlapping horizontal sections move towards each other, aligning the two perforations a22. Accordingly, the four L-shaped strips a21 respectively provided on the two side openings of the toothed sleeve a1 can clamp the sprocket B installed in the accommodating space a4, thereby improving the stability of the connection between the sprocket B and the toothed sleeve a2. In addition, the through part a3 can be a screw-on structure of bolt a31 and nut a32, and the locking part is a screw hole provided in the sprocket B in the accommodating space a4 corresponding to the through hole a22. Figure 2(Due to the L-shaped strips obscuring the screw holes, they cannot be shown.) Bolts a31 pass through the aligned through holes a22 on the four L-shaped strips a21 and the screw hole on the sprocket B, and are screwed into the nut a32 to secure the toothed sleeve a1 to the sprocket B. Alternatively, the through hole a3 can be a pin with external threads. The through hole a22 and the screw hole, when fitted with the pin, have internal threads. The pin passes through and screws into the through holes a22 on the four L-shaped strips a21 and the screw hole on the sprocket B, thus securing the toothed sleeve a1 to the sprocket B. The toothed sleeve a1 is fixed to the sprocket B. The through part a3 can also be a rivet-like fastening component, which directly passes through the through hole a22 and the screw hole to fix the toothed sleeve a1 to the sprocket B. The type of through part a3 and the connection structure of the through hole a22 and the screw hole are existing technologies, and this utility model does not limit them. The connection structure of the through part a3, the fixing part a2 and the locking part can further improve the stability of the connection between the sprocket B and the toothed sleeve a1.

[0029] Combination Figure 5 , 6 Figure 7 shows a schematic diagram of a second embodiment of the sprocket protective sleeve A' of this utility model. In this second embodiment, the distance between the two end edges of the toothed portion a11' and the protective sleeve a1' in the axial direction is not a tapered structure. That is, the thickness of the toothed portion a11' is constant and equal to the thickness of the chain teeth of a normal sprocket. The thickness of the chain teeth b1' of the sprocket B' it covers is equal to or less than the thickness of the toothed portion a11'. This allows the toothed portion a11' to provide protection for both tapered and non-tapered chain teeth of the sprocket. The fixing portion a2' on the protective sleeve a1' consists of at least two through holes a21' (the number of through holes a21' can be two, three, four, etc.) opened on the side wall between multiple adjacent toothed portions a11' of the protective sleeve a1'. Figure 5 and 6 (Seen as two in the image), while the locking part b2' is a sprocket B' located within the accommodating space a4' with at least two threaded screw holes b21' corresponding to at least two through holes a21'. The through part a3' consists of at least two hexagonal plug screws a31', which pass through the through holes a21' and are screwed into the corresponding screw holes b21' to secure the toothed sleeve a1' to the sprocket B'. In comparison, the structure of the sprocket protective sleeve A' in this second embodiment is simpler.

[0030] Furthermore, when there are two through holes a21', two threaded holes b21', and two hexagonal plug screws a31', the two through holes a21' are opened in asymmetrical positions on the toothed sleeve a1', and the two threaded holes b21' are opened in asymmetrical positions on the sprocket B' corresponding to the positions of the two through holes a21'. Thus, the asymmetrical fixing structure can effectively prevent the sprocket protective sleeve A' from wobbling during use.

[0031] In the first and second embodiments described above, the toothed sleeves a1 and a1' in the sprocket protective sleeves A and A' can be made by stamping metal cylinders or metal plates, and their material can be carbon steel, such as low carbon steel or high carbon steel, or alloy steel, such as manganese alloy steel or chromium alloy steel, so as to ensure that the sprocket protective sleeves A and A' have high structural strength and wear resistance.

[0032] In addition, this utility model provides a sprocket B suitable for the first embodiment of the sprocket protective sleeve A, combined with Figure 2 As shown, the sprocket B has a screw hole (not shown) corresponding to the through hole a22 on the L-shaped strip a21. The thickness of the sprocket B's teeth (not shown) and the sum of the thickness of the two tooth-protecting side plates a12 are equal to the thickness of the teeth of a normal sprocket. The width of the sprocket B's teeth and the sum of the thickness of the two side walls of the tooth-covering part a11 are equal to the width of the teeth of a normal sprocket. The diameter of the sprocket B and the sum of the thickness of the side walls of the two tooth-covering parts a11 are equal to the diameter of a normal sprocket. Thus, the sprocket B can be used in combination with the structure of the first embodiment of the sprocket protective sleeve A.

[0033] This utility model also provides a sprocket B' suitable for a second embodiment of a sprocket protective sleeve A', combined with Figure 6 As shown, the sprocket B' has a threaded hole b21' with internal threads corresponding to the through hole a21' on the toothed sleeve a1'. The thickness of the chain teeth b1' of the sprocket B' is equal to or less than the thickness of the chain teeth of a normal sprocket. The sum of the width of the chain teeth b1' of the sprocket B' and the thickness of the two side walls of the toothed portion a11' is equal to the width of the chain teeth of a normal sprocket. The sum of the diameter of the sprocket B' and the thickness of the two side walls of the toothed portion a11' is equal to the diameter of a normal sprocket. Thus, the sprocket B' can be used in combination with the structure of the second embodiment of the sprocket protective sleeve A'.

[0034] In addition, the aforementioned sprockets B and B' are also provided with shaft holes, assembly holes and other structures that are the same as those of ordinary sprockets. For structures that are the same as those of ordinary sprockets, this utility model will not elaborate further.

[0035] In summary, this utility model protects the sprocket teeth by covering the circumferential side of the sprocket with a protective sleeve, making the protected tooth portion the part that contacts the chain links to withstand contact wear caused during transmission. The sprocket inside the protective sleeve provides structural support for the overall sprocket structure. Since the sprocket does not contact the chain links during transmission, it does not wear and thus effectively extends the sprocket's service life. Furthermore, the protected tooth portion of the sprocket sleeve undergoes slight deformation under transmission forces, resulting in a tighter fit with the chain teeth and improving the stability of the connection between the sprocket and the protective sleeve. When the protective sleeve wears out due to long-term operation, it can be easily removed from the sprocket and replaced with a new one, allowing the sprocket structure to be reused. Since the cost of the protective sleeve is much lower than that of the sprocket, this reduces the operating and maintenance costs of the equipment and improves resource utilization due to the reusability of the sprocket.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the patent scope of the present utility model. Other equivalent changes made using the patent concept of the present utility model should all fall within the patent protection scope of the present utility model.

Claims

1. A sprocket cover for covering the circumferential side of a plurality of chain teeth of a sprocket, characterized by, The sprocket protective sleeve includes: a tooth protector and a through-hole. The tooth protector is cylindrical and has several tooth-enclosing portions protruding outward on its circumferential sidewalls corresponding to the several chain teeth. The tooth protector has an accommodating space with the same cross-sectional shape as the sprocket inside. The tooth protector has side openings on both sides that communicate with the accommodating space. The tooth protector is also provided with a fixing portion. The sprocket is disposed in the accommodating space through one of the side openings, and the several chain teeth are covered and fixed by the several tooth-enclosing portions. The through-hole passes through the fixing portion and the locking portion of the sprocket to fix the tooth protector to the sprocket.

2. The sprocket boot of claim 1, wherein, The distance between the two end edges of the toothed portion in the axial direction of the toothed sleeve gradually decreases along the direction away from the axis of the toothed sleeve.

3. The sprocket protective sleeve according to claim 2, characterized in that, Also includes: Several tooth-protecting side plates are provided, the shape of the side plates being the same as the cross-sectional shape of the tooth-covering portion, and the curvature of the side plates being the same as the curvature of the two end edges of the tooth-covering portion. The several tooth-protecting side plates are fixedly attached to the two end edges of the several tooth-covering portions with their concave surfaces facing the interior of the tooth-covering portion.

4. The sprocket protective sleeve according to claim 3, characterized in that, A slit is formed on the sidewall between two adjacent toothed portions of the tooth protector along the axial direction of the tooth protector. The sidewalls of the tooth protector on both sides of the slit can separate in opposite directions under the action of two opposite external forces. When the two opposite external forces disappear, under the action of the deformation recovery force of the tooth protector, the separated sidewalls of the tooth protector close together and form the slit between them.

5. The sprocket protective sleeve according to claim 4, characterized in that, The fixing part is composed of four L-shaped strips, the surfaces of which are parallel to the cross-section of the tooth protector sleeve. Each of the four L-shaped strips has a perforation in its horizontal section. Two L-shaped strips are stacked facing each other with their horizontal sections aligned, and their perforations are aligned. The upper ends of the vertical sections of these two L-shaped strips are fixedly attached to one side edge of the sidewall between two adjacent tooth protectors on each side of the fracture. The other two L-shaped strips are also stacked facing each other with their horizontal sections aligned, and their perforations are aligned. The upper ends of the vertical sections of these other two L-shaped strips are fixedly attached to one side edge of the sidewall between two adjacent tooth protectors on each side of the fracture. The upper end is fixedly attached to the other side edge of the side wall between two adjacent toothed parts on each side of the fracture. When the horizontal segments of the two L-shaped strips and the other two L-shaped strips are subjected to two opposite external forces on the side walls of the fracture, they move in opposite directions and misalign the two perforations. When the two opposite external forces disappear, under the deformation recovery force of the toothed sleeve, the two horizontal segments that are stacked on each other move towards each other and align the two perforations on them.

6. The sprocket protective sleeve according to claim 5, characterized in that, The through-hole is a bolt and nut screw-in structure, and the locking part is a screw hole opened by the sprocket in the accommodating space corresponding to the through hole. The bolt passes through the through holes of the four L-shaped strips and the screw hole of the sprocket and is screwed into the nut to fix the toothed sleeve to the sprocket.

7. The sprocket protective sleeve according to claim 1, characterized in that, The fixing part consists of at least two through holes opened on the side wall between multiple adjacent toothed parts of the toothed sleeve. The locking part consists of at least two threaded holes with internal threads opened on the sprocket in the accommodating space corresponding to the at least two through holes. The through part consists of at least two hexagonal plug screws, which pass through the through holes and are screwed into the corresponding threaded holes to fix the toothed sleeve to the sprocket.

8. The sprocket protective sleeve according to claim 7, characterized in that, When there are two through holes, two threaded holes, and two hexagonal plugs, the two through holes are opened at asymmetrical positions on the toothed sleeve, and the two threaded holes are opened at asymmetrical positions on the sprocket, corresponding to the positions of the two through holes.

9. A sprocket suitable for the sprocket protective sleeve of claim 6, characterized in that, The sprocket has a screw hole corresponding to the through hole, and the sum of the thickness of the sprocket teeth and the thickness of the two tooth-protecting side plates is equal to the thickness of the teeth of a normal sprocket. The sum of the width of the sprocket teeth and the thickness of the two side walls of the tooth-protecting part is equal to the width of the teeth of a normal sprocket. The sum of the diameter of the sprocket and the thickness of the two side walls of the tooth-protecting part is equal to the diameter of a normal sprocket.

10. A sprocket suitable for the sprocket protective sleeve of claim 7, characterized in that, The sprocket has at least two threaded holes corresponding to the at least two through holes, and the thickness of the sprocket teeth is equal to or less than the thickness of the teeth of a normal sprocket. The sum of the width of the sprocket teeth and the thickness of the two side walls of the toothed portion is equal to the width of the teeth of a normal sprocket. The sum of the diameter of the sprocket and the thickness of the two side walls of the toothed portion is equal to the diameter of a normal sprocket.

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